Book 2 Chapter 6 "THE BLIND BANDIT"

Aang is still searching for an earthbending teacher, but with little success. At Xin Fu's underground earthbending tournament, Team Avatar witnesses a display of powerful earthbending against a fighter named The Boulder by a young blind girl named "The Blind Bandit", whom Aang recognizes as the girl from his vision in the swamp. She uses earthbending to sense her environment, perceiving the lay of the land around her; she therefore fits Bumi's advice that Aang's earthbending instructor should be someone who "listens and waits before striking". The girl, Toph Beifong, cannot become Aang's teacher due to her wealthy and overprotective parents, who attempt to keep her isolated from any danger. Xin Fu kidnaps Aang and Toph, thinking he was cheated out of prize money by them. Toph reveals her power by defeating Xin Fu's gang singlehandedly, but her parents become even more restrictive. She runs away from home and joins Aang. Toph's father, believing Aang has kidnapped her, promise Xin Fu and Master Yu a chest of gold if they bring her back.